Paper-bag machine.



PATENTED MAR. 12, 1907.

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w. A. LORENZ. PAPER BAG MACHINE. APPLICATION FILED NOV. 12. 1900.

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A Inventor:

1M: NORRIS PETERS 60-. wAsHmumN. a. c.

No. 847,194. PATENTED MAR. 12, 1907. w. A. LORENZ.

PAPER BAG MACHINE. APPLICATION FILED NOV. 12. 1900.

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N0. 847,194. PATENTED MAR. 12, 1907. V 1 WI Al 'rAra BAG MACHINE.APPLIUATION FILED NOV. 12, 1900.

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Witnesses Inventor:

No. 87,l9 1. PATENTED MAR. 12, 1907.

w. A. LORENZ.

PAPER BAG MACHINE. APPLICATION FILED nov. 12, 1900.

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UNITE srarns ATENT FICE.

PAPER BAG MACHINE COMPANY,

OF PHILADELPHIA, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA.

PAPER-BAG MACHINE.

Specification of Letters Patent.

Patented March 12, 1907.

Application filed November 12, 1900. Serial No. 36,177.

To (ZZZ whom it TIMI/U concern.-

Be it known that I, WVILLIAM A. LORENZ, a citizen of the United States,residing at Hartford, in the county of Hartford and 5 State ofConnecticut, have invented certain new and useful Improvements inPaper-Bag Machines, of which the following is a full, clear, and exactspecification.

This invention relates to paper-bag machines, and more especially tothat class thereof in which square-bottom bags are formed frombellows-sided or tucked tubing; and it has for its object the provisionof a machine of this type whereby the socalled r diamond fold, includingthe associated complex triangular folds which must be formed in thebellows sides of the tubing, is formed in a rapid and easy mannerpreparatory to having its flaps supplied with paste and subsequentlyfolded to complete the bag.

My invention comprises as one of its features a blank-folding memberhaving a defining edge and which is pivoted at a point remote from saidedge and. mounted for movement toward and away from the blanksupportingsurface of a suitable carrier upon which the blank to be folded isretained and which is at the same time advanceable with theblank-carrier adapted for cooperation with the blank-folding member toopen out the open end of the blank in amanner to be hereinafter setforth.

My invention has for one of its objects the combination, with a foldingmember as just member is mounted for oscillation and which is adaptedfor movement so as to cause said defining edge to advance with theblank-carrier during the diamond-forming operation.

My invention includes as one of its features mentioned. is cooperativelymounted with a traveling blank-carrier having a fixed axis,

while the defining edge of the blank-folding member is caused to move ina variant path relatively to the blank-supporting surface of theblank-carrier and whereby said edge is maintained at a distance from theblankcarrier while the diamond of the bag is being formed.

In the drawings accompanying this specification, and in which similarcharacters designate similar parts, Figure 1 is a front view of amachine constructed in accordance with my invention. Fig. 2 is a sideview thereof. Fig. 3 is a vertical section taken on line 3 3, Fig. 1.Fig. 4 is a top view of the blank-folding member and its mountings. Fig.5 is a fractional side view of the blank-carrier, illustrating theblank-folding member and the carrier near their initial position andwhen commencing to open out the end of the blank. Fig. 6 illustrates theparts in position when the blank has been opened out sufficiently toassume what is generally called the box form. Fig. 7 is a front view ofthe blank shown in Fig. 6. Fig. 8 illustrates the parts in position whenthe diamond has been substantially completed, and Fig. 9 is a front viewof the blank shown in Fig. 8, and Fig. 10 is a diagram illustrating themovement and described, of a carrier in which the folding operation ofthe blank-folding member and the defining edge during thediamond-forming operation.

In the drawings, 10 designates the bed plate, to which are secured apair of upright side frames 11 and 12, in which the several parts foroperating the various devices are supported. Suitable means are providedfor feeding blank or bellows-sided tubing in the machine, such meansconsisting in the present instance of suitable feed-rollers 13 14,mounted on shafts 15 16, respectively, the latter being journaled inboxes 17, movably held in the side frames and acted. upon by l suitablesprings. (Not shown.) The feedrollers are caused to cooperate with eachother by means of gears 18 and 19, mounted on said shafts, and saidfeed-rollers may be driven by an intermediate gear 20, journaled i onthe sideframe 1 1 and obtaining motionfrom a gear 21, mounted upon theshaft 22, which l constitutes the main shaft of the machine and to whichmovement is imparted by a pinion 23, mounted upon the driving-shaft 24of the machine, to which power may be apl plied from any ordinarysource-as, for instance, by tight and loose pulleys 25 and 26. (See Fig.1.) From the feed-rollers the l blank or tube is conducted to a suitablecar rier serving as a support for holding the blank during the bottom ordiamond forming operation. This carrier is in thepresent instance of therotary type and consists,

substantially, of a cylinder, such as 27, mounted on the shaft 22, abovementioned, and provided with a plurality of sets of tuckholders andfront diamond-holders, wherelr y the successive blanks are engaged andheld. on the carrier while the diamond is beii'g formed. Thetuck-holders for holding the lower ply of the tube on the carrier aredesignated in the drawings by 28 and are journaled at 29 on the carrier,while they are provided with extensions 28, on which camrollers 30 arejournaled. These cam-rollers travel around the periphery of suitable cans 31, which cause the tuck-holders to engage the blank on both sidessimultaneously and at the proper time and against the action of springs31. The front diamond-holder, for engaging or holding the front end ofthe lower ply of the tube or blank, is shown herein as a holder 32,journaled at 33 in the web of the carrier and carrying a roll 34,adapted to be engaged by cam portions 35 and 35, by the former of whichsaid holder will be opened'to receive a blank, while the latter, 35,serves for opening said holder to Y release the blank at the propertime, a spring 36 being employed for placing said holder over the lowerply of the blank.

The blank-folding member, which, as has above been stated, is connectedfor cooperation with the carrier, is herein illustrated as a plate, oneedge of which serves as a bottomdefining edge and which is mounted foroscillation and reciprocation toward and from and also with. thecarrier. Furthermore, as has above been stated, my invention has for oneof its objects the provision of means whereby the defining edge of theblank-folding member may be caused to travel in a predetermined pathviz,in contact with or at a distance from the carrier, so that as thecarrier and blank-folding member coact in opening out the open end ofthe bag-blank the so-called inside triangular folds may be easilydeveloped by stretching out the tucked sides of the tube or blank. Theblank-folding member herein shown consists, substantially, of a plate37, having a defin ing edge 38 and provided at its sides with brackets39, having trunnions 40, the axes of which are in alinement with eachother and remote from said edge. The brackets 39 have extensions41,adapted to receive suitable means for engaging the upper ply of theblank and for holding the same against the plate 37. lhese means consistin the present instance of box-holders 42, pivoted in the extensions 41and having tailpieces 43 to be engaged for opening the same at theblankreceiving end of the stroke by abutments 44, which may be securedto a fixed shaft or bar I 45,held in the side frames.

The box-holders may be operated to close against the plate 37 by asuitable spring, such as 46, connected with both holders. The pivots ortrunnions 40 of the blank-folding member are in the present instancesupported in the ends of arms 47, mounted upon spindles 48, which arejournaled in the side frames 1 1 and 12, both spindles being caused tooscillate in unison by pinions 49, secured thereto and engaged bysectors 50. These sectors are journaled on studs 51, held. in the sideframes of the machine, and have arms 52, connected. by links 53 and 53with arms 54, secured upon a rock-shaft 55, constituting a medium foroperating both trunnions simultaneously. It should be noted here thatthe axes of the spindles are disposed eccentrically relatively to theaxis of the blank-carrier and more particularly adjacent to theblank-supporting surface of the blank-carrier, so that as theplate-carrier (composed of the arms 47) is caused to oscillate aroundsaid axes the pivots 40 will have amovement away from and toward theblank-supporting surface,

or, in other words, that on account of its peculiar organization thesaid pivots of the blank-folding member will have a rise-andfallmovement relative to the blank-carrier. Since in the present instancethe blank-carrier has a fixed axis and inasmuch as the blank-foldingmember is pivoted at a point remote from the defining edge, the locationof the pivot-axis of the plate-carrier should be necessarily such as topermit the defining edge to avoid interference with the blankcarrierduring its oscillation in said platecarrier, and my invention includesas one of its features a blank-folding member having a defining edgewhich is guided in a predetermined path relative to the blank-carrierand in such a manner that a suitable distance be tween said edge and theblank-carrier will be maintained during the time when the blank isopened. out into the diamond form.

From the above it will be understood that the blank-folding member ismounted for oscillation in a carrier which is advance-able with theblank-carrier, and means are provided whereby proper oscillatorymovement may be imparted to said blank-folding member in its carrier,the means i lustrated in the present instance comprising a pinion 56,mounted upon one of the trunnions 40 and engaged by an internal.gear-segment 57. 1f now the latter were stationary, a forward swingingmovement of the arms 47 would cause the blank-folding member to beadvanced, but the edge 38 of said folding member would not move in apath with the proper ratio of speed relative to the peripheral advanceof the blank-carrier 27. Hence it is evident that in order to modify theregular forward rotation of the plate 37so as to conform to the travelof the blank-carrier means should be provided whereby the plate shall berotated in its carrier proportionately to the advance movement of thecarrier 47. In other terms, the rotary movement of the plate 37 in thearms 47 must be modified during the comparatively regular movement ofthe said arms, and for this reason the internal gear segment is alsomounted for advancing rotating movement during the coaction of thefolding member with the blanlecarrier whenopening out the blank andsubstantially in the following manner: The pinion 56 is in engagementwith the internal segment 57, the hub of which is in its turn providedwith gear-teeth 58, in engagement with a sector 59, which may be journaed on a stud 60, held in the side frame 11. The sector 59 carries an arm6], having at its free end a camroller 62 in engagement with a camgroove63, formed in the side of the cam 64, secured to the shaft 22 of themachine. 'T he cam 64 has also another cam-groove 65, engaging a roller66 (see Fig. 3,) which is ournaled on one of the arms 52 and wherebyproper oscillatory movement may be imparted to the sector 50 abovementioned.

Referring now to the diagrammatic view, Fig. 10, the movement of thedefining edge 38 relative to that of the blank-carrier and resultingfrom the organization of the mechanism. above described is clearlyshown, a number of succeeding positions having been chosen to illustratethe operation. In order to facilitate the understanding of the diagram,the several elements thereof have been designated by characterscorresponding to the several machine elements as hereinbefore given,said characters being supplemented by (a7) ((bJU (to)?! Kid)! ((8)77(fy)! that the lines and points belonging to each position may bereadily distinguished. In this figure the starting positions of theseveral parts are indicated by the supplemental letter a, and theblank-carrier is shown as being turned for a number of equal peripheralspacesas, for instance, from 27* to 27 and then to 27", 27, and 27 whilethe position 27 indicates that which the initial point 27 will occupynear the end of the diamondforming operation and when the blank-foldingmember 37 and the defining edge 38 will have arrived at the end of theirforward movement. As the periphery of the blankcarrier travels from thepoint 27 to the point '27 the defining edge will move from 38 to 38substantially in a straight line and in such a manner that the edge 38comesabove the carrier-point 27*, after which the edge 38 advances withthe point 27 throughout the diamond-forming operation and until theposition f has been reached. The pinion 56 is initially in engagementwith the internal gear 57 at the point 57 and while the trunnion 40 ofsaid pinion 56 travels from the position 40 to the position 40 theinternal gear ments and their operating mechanism may be clearlyunderstood, said positions being furthermore differentiated from eachother by differently-characterized lines, so that each group of elementsbelonging to one position may be recognized at a glance.

It will be observed that during the diamond-fold-forming operation,while the trunnions 40 travel from the position 40 to the position 40the folding mechanism or devices supported by the trunnions 40 are movedforwardly bodily through a curved path which is concave toward theblanksupport by the arms '47, which are pivotally supported in turn onthe concave side of the path of the trunnions. By this arrangement theperiod during which the diamond-foldforming operation is carried out ismaterially prolonged over what it would be if the trunnions 40 were notgiven a movement with the blank-carrier during the saiddiamond-foldforming operation, thereby affording more time for therequired unfolding and refolding of the tucked sides of the blank. Atthe same time the velocity of movement of the axis of the trunnions 40is such that the axis travels in a circular are about an axis which isadjacent to and advances with the same angular speed as the folding bed,the lastmentioned axis being of course coincident with the primarytransverse crease-line formed in the upper ply of the blank. In otherwords, the axis of the trunnions 40 during its forward movement andwhile describing an are relative to the stationary parts of the machineabout the shaft 48 as an axis travels also relative to the moving blankin a circular are about the primary transverse crease-line of the upperply of the blank.

An important feature of my invention is the provision of means by whichthe folding devices which are pivotally connected to the arms 47 to turnrelatively thereto about an axis laterally displaced from the primarytransverse crease-line formed in the upper ply of the blank are moved bythe arms to carry the folding devices with the folding bed to prolongthe period of the folding operation and also away from and toward thefolding bed. in such a manner that the desired clearance between thefolding devices and each folding bed may be had without giving anyrising-and-falling movement to the folding bed to accommodate it to themovement of the folding devices, and each folding bed may therefore bemoved so that its blankengaging surface is carried through a path whichis practically a continuation of itself.

From the foregoing description it will be seen that the blank-foldingmember 37 has an oscillatory movement in its carrier, while at the sametime the carrier itself is oscillated around its pivotaxis until theposition shown in Fig. 8 has been reached, when it becomes necessaryagain to open the boxholders 42 to release the blank and when thediamond is substantially completed. The box-holders are opened at thispoint by devices which are in the present instance carried by the arms47 and which consist, substantially, of fingers 67, preferably formedintegral with said arms and adapted to engage the tailpieces 43 of thebox-holders, shown in Fig. 8.

Interposed between. the feed-rollers 13 14 and the carrier 27 is aguide-plate 68, whereby the blank as it is fed forward by the feedrollswill be guided with its front end between the folding member and thecarrier and which may also be secured to the shaft or bar 45 abovementioned.

J ournaled in the side frames is a shaft 69, obtaining motion through agear 69 in en gagement with the gear 2] and carrying a cam in engagementwith a roller 71, which is journaled on an arm 72, actuated by a spring72 and one end of which carries a drop-plate 74, adapted to cooperatewith the blank-carrier for flattening the diamond after the tuck holdersand box holders have stretched out the sides of the tucked tube. Afterthe diamond has been flattened by the drop-plate the blank may becarried by the carrier into contact with a paster-roll 7 5, mounted onthe shaft 69, and whereby the blank may be supplied with paste, andthen. subjected to the action of a delivery-roll 76, which may bemounted on the shaft 24 above mentioned. '1 his delivery-roll serves toheld the blank on the carrier after the holders have been releasedtherefrom, and the blank may then be deflected by a plate, such as 77,toward folding devices (not shown) whereby the blank may be transformedinto the completed bag.

The operation of my improved machine is as follows: Bellows-sided ortucked tubing is introduced into the machine by the 1eed rolls 1314 andguided by the plate 68 into position between the blank-folding member 37and the carrier 27 in such a manner that the tuck-holders 28 and thefront (liamoncl- 1 holder 32 will engage the lower ply of the blank, asshown in Fig. 5. While the blank is delivered to the tuck-holders theboxholders 42 of the blank-folding member 37 are open and the movementof the blankfolding member is so timed relatively to the movement of theblank-carrier that the front edges of the tuck-holders and box-holderswill move in alinement with each other, whereupon both blank-carrier andthe defining edge of the blank-folding member will travel in unisonduring the formation of the diamond. The path which the defining edgetraverses during the working stroke thereof is such that the distancebetween said edge and the blank-carrier will be substantially maintainedduring the greater portion of their combined forward travel, saidblankfolding member being caused to oscillate in its carrier, while thelatter is oscillated to advance the pivot-support of the folding memberin a certain predetermined ratio relative to and with the blankcarrier.In this manner the blank-folding member is practically turned over andabout said defining edge as an axis, thus gradually separating thebox-holders from the tuck-holders, which action will result in openingout the tucked sides and form the inside triangular folds, as shown inFigs. 6 and 7, which illustrate the tucked tube opened out into asocalled box form. In Fig. 8 the blankfolding member is shown as havingarrived at the end of its stroke and illustrating the drop-plate in itslowered position, substan tially completing the diamond, the face viewof which is illustrated in Fig. 9. At this time the fingers 67 have beenthrown sufiiciently inward to release the box-holders from the blank,and the latter is drawn forward from under the-drop-plate 74 and intosupplied to the blank, and at the same time the folds of the sides maybe more sharply creased preparatory to subjecting the blank toflap-folding devices. (Not shown.)

It is obvious that the construction of the machine as shown anddescribed may be varied in many ways without departin from the spirit ofmy invention, and while have shown a rotary blank-carrier in connectionwith a blank-folding member organized according to my improvement it isevident that other forms of carriers may be substituted therefor.

In my copending applications, Serial No. 27,864, filed August 23, 1900;Serial No. 32,123, filed October 5, 1900, and Serial No. 35,086, filedNovember 1, 1900, I have i shown, described, and claimed certain novel 1features shown and described but not claimed herein. In so far as thisapplication discloses matter described and claimed in said priorapplications it is to be regarded as subordinate to them.

Having described my invention, what I claim as new, and desire to secureby Letters 1. In a bag-machine, mechanism for forming diamond folds on abellows-sided bagi blank, including in combination a foldingbed, meansfor moving said bed to carry its Patent, is I contact with a roll 75,whereby paste may be blank-engaging surface through a path which I ispractically a continuation of said surface, means for holding abag-blank against said surface, a carrier, folding devices pivotallysupported by the carrier to turn relatively 1 thereto about an axis,means for moving said l carrier during the folding operation to carrysaid axis through a path concave toward the 1 folding-bed and with sucha velocity relative to that of the bed, that said axis travels in asubstantially circular path about a second axis l which is adjacent theblank-engaging surface l of the folding-bed and has substantially thesame movement of advance as the folding-bed, and means for turning thefolding devices relatively to the carrier about the first-mentioned axisas the latter moves through said concave path.

2. In a bag-machine, mechanism for forming diamond folds on abellows-sided bagblank, includingin combination a foldingbed, means formoving said bed to carry its blank-engaging surface through a path whichis practically a continuation of said surface means for holding abag-blank against said surface, a carrier, folding devices pivotallysupported by the carrier to turn relatively thereto about an axis, meansfor moving said folding devices during the folding operation to carrysaid axis through a path concave toward the folding-bed, said meanscomprising a pivotal support for the carrier located on the concave sideof the path of said axis and means for oscillating said carrier aboutsaid pivotal support, and means for oscillating said folding devices onsaid carrier about said axis.

3. In a bag-machine, mechanism for forming diamond folds on abellows-sided blank including in combination a rotary blank-support,means for holding the lower ply of the blank to the support, carriers,means for oscillating the carriers about a center adjacent to the rotarypath of the blanksupport, folding devices moved by said carriers withthe support during the triangular-fold-forming operation through acurved path concave toward the rotary path of the bed, and means foroperating said folding devices on their carriers to engage and open theblank.

4. In a bag-machine, mechanism for forming diamond folds on abellows-sided blank including in combination a blank-support rotatingabout a fixed axis, means for holding the lower ply of the blank to thesupport, carrier-arms, means for oscillating them about a fixed axisremote from the axis of the blank-support, folding devices carried bysaid carriers during the diamond-folding operation with the supportthrough a curved path concave toward the rotary path of the bedincluding a folding member mounted for oscillation upon the carrier-armsand having a defining edge at a distance from its axis less than thegreatest distance to which the axis moves away from the rotary path ofthe bed whereby said defining edge may be carried clear of theblank-support as it swings back and forth over that support.

5. In a bag-machine, mechanism for forming diamond folds onbellows-sided blanks, including in combination a blank-support rotatingabout a fixed axis, carrierarms, a blank-folding member having adefining edge and pivotally supported upon said carrierarms to turnrelatively to said arms about an axis remote from said defining edge,means for moving said carrier-arms to carry said blank-folding memberduring the diamondforming operation, with the support through a curvedpath concave toward the blanksupport, means for holding the lower ply ofthe blank to the support, a box-holder cooperating with the foldingmember, and means including toothed gearing for oscillating theblank-folding member upon its axis of movement relative to said arms.

6. The combination with a rotary blankcarrier having tuck-holders, of acarrier pivotally supported to turn about an axis adj acent theblank-supporting surface of the blank-carrier, a blank-folding memberhav ing a defining edge and box-holders pivotally supported by saidcarrier to turn relatively thereto about an axis remote from said edge,means for oscillating said carrier about its axis to move theblank-folding member with the support through a curved path concavetoward the blank-carrier during the diamondforming operation, and meansfor oscillating the blank-folding member about its axis of movementrelative to the carrier during said operation.

7. In a bag-machine, mechanism for forniing diamond folds on abellows-sided bagblank, including in combination a blank supportrotating about an axis, means for holding the lower ply of a bag-blankthereto, a carrier-arm mounted for oscillation about a fixed axislaterally displaced from the axis of the blank-support, folding devicespivotally supported by said arm, means including a toothed gear securedto said arms concentrically with its axis for swinging said carrier tomove the folding devices with the support through a curved path concavetoward the blank-support, and means including toothed gearing foroscillating said folding devices relative to said carrier.

8. In a bag-machine, mechanism for forming diamond folds on abellows-sided bagblank including in combination a blank-support rotatingabout a fixed axis, means for holding the lower ply of a bag-blankthereto, carrier-arms pivotally supported to turn about an axis remotefrom the axis of the blank-support, folding devices pivotally supportedon said arms, means for oscillating said arms to carry said foldingdevices during the diamond-forming operation with the ICO arms duringsaid operation, including a gearappurtenant to the blank-folding devicesand concentric with their axis of oscillation relative to the arms, andcooperating gear ing pivotally supported to turn about an axis inalinement with the axis of oscillation of the carrier-arms.

9. In a bag-machine, mechanism for form ing diamond folds on abellows-sided blank, including in combination a blank-support rotatingabout a fixed axis, means for holding the lower ply of a blank thereto,carrier-arms pivotally supported to turn about an axis remote from theaxis of the blank-support, folding devices pivotally supported upon saidarms and including means for engaging the upper ply of the blank, meansincluding a gear appurtenant to the said carrier-arms for swinging themabout their axis to carry the folding devices during the diamond-formingoperation with the support through a curved path concave toward theblank-support, a gear appurtenant to the folding devices and concentricto the axis of oscillation thereof, and cooperating gearing journaledconcentrically with the axis of oscillation of said arms for oscillatingthe folding devices relatively to the arms as the latter are movedforward and back.

10. In a bag-machine, mechanism for forming diamond folds on abellows-sided blank including in combination a blank-support pivotallysupported to rotate about a fixed axis, means for holding the lower plyof the blank to the blank-support, a carrier-arm mounted for oscillationabout an axis remote from the axis of the blank-support, folding devicespivotally supported upon the said arm to turn about an axis situatedoutside of the rotary path of the blank-support, means including a camfor swinging said arm forward and back to carry the folding devices,during the diamond-forming operation, with the support through a curvedpath concave toward the blank-support and means for operating thefolding devices on the arm as the latter is oscillated, comprising amember pivoted to turn about an axis in aline ment with the axis ofoscillation of said arm.

11. In a bag-machine, the combination with the blank-support, of meansfor holding the lower ply of the blank to the support, blank-foldingmechanism, comprising a folding-plate and box-holders, a swingingcarrier pivotally supporting said plate, means for pivotally supportingsaid carrier, means for swinging said. carrier relatively to its supportto move the folding-plate duringthe diamond-forming operation with thesupport through a curved path concave toward the blank-support,includinga gear concentric with the pivotal support of the carrier, and

means for oscillating the plate relatively to the carrier, including agear secured to the plate, and a connecting driving-gear thereforsituated concentric with the pivotal support of the carrier.

12. In a bag-machine, mechanism for forming diamond folds on abellows-sided blank, including incombination a blank-support pivotallysupported to turn about a fixed axis,

means for holding the lower ply of the blank to the support, acarrier-arm, means pivotally supporting said arm for oscillation aboutan axis laterally displaced from the axis of the blanksupport, a fol dindevice pivotally supported on said carrier-arm, means for swing ing saidarm about its pivotal support to carry said folding device with thesupport through a curved path concave toward the blank-support, andmeans for oscillating said folding device relative to said carrier-armduring the movement in said path, including a gear secured to the deviceand a gear concentric with. the pivotal support of said carrier.

13. In a bag-machine, mechanism for forming diamond folds on abellows-sided blank, including in combination a rotary blank-support,means for holding the lower ply of the blank thereto, a carrier-arm,means pivotally supporting said arm, a box-holder pivotally supported bysaid arm, means for oscillating said arm including a toothed gearmounted concentrically with the pivotal support for said arm, and meansfor oscillating said boxholder relative to said arm including a toothedgear journaled concentrically with. the pivotal support of said arm.

14. In a paper-bag machine, mechanism for forming diamond folds on abellows-sided blank, including in combination a rotating folding-bed,means for securing the lower ply of the blank to the bed, an armextending over the folding-bed, means pivotally sup porting said arm,devices mounted on said arm for engaging the upper ply of the blank,said devices including a shaft journaled in said arm at one side of theaxis of oscillation of the arm relatively to its pivotal support, meansfor oscillating said arm relative to its support, including a gearconcentric with the axis of said pivotal support, and means foroscillating said shaft, including a gearv also mounted concentricallywith. the axis of oscillation of said arm.

15. A rotary blank-support constituting a folding-bed, means for holdingthe lower plies of successive blanks on the blanlcsupport, afolding-plate provided with means including box-holders for folding backthe upper plies of the successive blanks, an arm pivotally supportingthe said plate and mounted for oscillation upon an axis located ineccentric relation to the circle of rotation of the blank-support, meansincluding a sector for oscillating the folding-plate upon itspivot-axis, and means for oscillating the "arm to move the said axis ofthe folding-plate forward relative to the direction of movement of theblanksupport.

16. A rotating blank-support constituting a folding-bed, means forholding the lower plies of successive blanks upon the support, ablank-folding plate, provided with means including box-holders forfolding back the upper plies of the successive blanks carried by thesupport, a plate-carrier mounted for swinging movement on an axislocated eccentric to the circle of rotation of the blankcarrier, meansfor swinging the plate-carrier on its axis, and means including asectorgear for swinging the folding-plate upon the plate-carrier.

17. In a bag machine, mechanism for forming diamond folds on abellows-sided blank, including in combination a foldingbed rotating in acircular path about a fixed axis, means for holding a bag-blank againstsaid bed, a carrier, folding devices pivotally supported by said carrierto turn relatively l thereto about an axis, said devices including afolding-plate having a defining edge remote from the axis of the foldingdevices, means I for moving the last-mentioned axis during the foldingoperation through such a predetermined path concave toward the path ofthe folding-bed that the maximum separation between said paths is notless than the distance between the axis and defining edge of thefoldingplate, said means comprising a pivotal support for the carrierlocated between the axis of movement of the bed and said predeterminedaxis-path and means for turning the carrier during the folding operationabout its pivotal support in the same direction as the folding-bed turnsabout its axis, and means for oscillating the folding devices relativeto saidcarrier as the latter Witnesses:

CHAS. F. SOHMELZ, NELLIE PHOENIX.

